[modeleng] Re: Unknown thread
- From: "alanjstepney" <alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Fri, 15 Oct 2004 10:30:29 +0100
Tim,
That is a good point.
I too recall that BA was based upon the Swiss/French, and so the angles
could be the same.
(Of course there are /were also Waltham and Loewenhertz and Holtzapfels
threads, to say nothing about Whitworth instrument. Probably some more
obscure ones too.)
You could work out the thread angle from the core diameter, tpi, and OD.
Might be easier to find a chart and look it up though.
alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
www.alanstepney.info
Model Engineering, Steam Engine, and Railway technical pages.
----- Original Message -----
From: "Tim Rickard" <the_viffer@xxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Friday, October 15, 2004 9:42 AM
Subject: [modeleng] Re: Unknown thread
Alan
I'm not sure if they are 60 deg threads.
My recollection was that in accordance with our Imperialist traditions we
stole the Thury thread off the French Swiss because they obviously couldn't
be trusted with it with them being foreign chappies and rebranded it as the
BA thread.
Certainly there are a lot of very close similiarites between the Thury and
BA dimensions but I'm not certain without some delving which I'll try and do
what the angle was. I tather think it may be the same as BA
Good luck to our correspondent in trying to cut one of these threads
whatever the angle.
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